think about it logicaly for a few seconds.............................

high tempreature water in a bucket (90deg C), low tempreature water (20deg C) in an idetical bucket (no treadmills or aeropanes involved)

presume ground is perfectly coducting and has a tempreature of -10deg C, and the air tempeature is -10deg C

The rate of evaporation (and so cooling by the enthalpy of vapourisation) is (for the sake of argument assumed to be, we wont go into 5 film theory, an convection currents) proportional to tempreature. Ditto the rate of heat loss by conduction.

So initialy the hot bucket loses heat (and thus lowers in tempreature) at a greater rate than the low tempreature bucket.

But as it cools this rate lowers.

so when the high tempreature bucket is at 20deg C, its rate of heat loss will be the same as the low tempreature bucket was originaly, however, the low temp bucket has now cooled to 5 deg, etc etc etc

Yes i have heard of the Mpemba pheomenon, but that only aplies in certain coditions, in reality you'd have to devise your experiment to take advantage of it.

wouldnt just be 2 buckets, the buckets would need to be the right shape/size and filled to the correct level as well,

and it presumes no forced convection, i.e. your not stirring it, so the situation where its runnig down your windscreen in a very thin film, is probably about as likely to exibit the Mpemba phenomenon as i am to win the lottery (nearly impossibe seeing as i dont play)

Start the car ,lock the car then go in for tea.
I tried the water method but it ended up in the locks and then they would freeze up, Don't suppose that matters as much with the remote locking now come to think of it